What are the three formulas in Ohms law

Ohm's law is a fundamental law of electrical engineering that states that the current through a conductor is directly proportional to the voltage across the conductor, provided that the resistance of the conductor remains constant.

Ohm's law is expressed mathematically by the following equation:

V = IR


  • V is the voltage across the conductor (in volts)

  • I is the current through the conductor (in amperes)

  • R is the resistance of the conductor (in ohms)

Ohm's law can be used to calculate any of the three variables (V, I, or R) if the other two variables are known.

For example, if you know the voltage across a conductor and the current through the conductor, you can use Ohm's law to calculate the resistance of the conductor.

R = V / I

Ohm's law is a very important law in electrical engineering and is used in the design and analysis of electrical circuits.

Ohms law example

Consider a circuit with a resistor and a battery. The battery provides a voltage of 12 volts and the resistor has a resistance of 10 ohms.

Using Ohm's law, we can calculate the current through the resistor:

I = V / R

= 12 volts / 10 ohms

= 1.2 amperes

Therefore, the current through the resistor is 1.2 amperes.

Applications of Ohm's law

Ohm's law is used in a wide variety of applications, including:

  • Designing and analyzing electrical circuits

  • Troubleshooting electrical circuits

  • Selecting resistors and other components for electrical circuits

  • Measuring current, voltage, and resistance

Ohm's law is an essential tool for anyone who works with electronics. It is a simple law to understand, but it has many powerful applications.